Could not receive data by ajax in same domain

I am developing an addon and try to get some settings in Twitter.com. I do ajax in twitter.com to receive some information I need , but I can’t get enough data that most data were hidden. This situation will not happen in other browsers. Should I do some settings to avoid that? Could you help me solve it? Thank you.

Host permissions allow you to bypass CORS if that’s what you’re having trouble with.